Rocket Propelled Java - Devoxx12
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Project Lombok allows developers to add annotations to reduce boilerplate code. It works by using annotation processing at compile time to modify bytecode. Lombok provides annotations like @Getter and @Setter to automatically generate getter and setter methods. Lombok-pg extends Lombok with additional annotations. Groovy also supports compile time metaprogramming through AST transformations, allowing changes to bytecode and visibility to other JVM languages.
Rocket Propelled Java - Devoxx12
- 2. Rocket Propelled Java Andres Almiray Canoo Fellow Canoo Engineering AG @aalmiray
- 3. Andres Almiray Speaker Bio ■ Java developer since the beginning ■ True believer in open source ■ Groovy committer since 2007 ■ Project lead of the Griffon framework ■ Currently working for 3
- 4. Project Lombok Where, Who, How? Why? ■ http://projectlombok.org/ ■ Get rid of boiler plate code index.html ■ Compiler does the heavy lifting ■ Reinier Zwitserloot @surial ■ Developers just have to write the ■ Roel Spilker @rspilker essentials ■ Relies on JDK6’s Annotation Processor ■ Modifies Bytecode at compile time 4
- 5. How does it look? import lombok.Data; import lombok.ToString; @ToString(includeFieldNames=true) @Data public class DataExample { private final String name; private final String lastName; private int age; } 5
- 6. Annotations ■ @Getter / @Setter ■ @Cleanup ■ @ToString ■ @Synchronized ■ @EqualsAndHashCode ■ @SneakyThrows ■ @NoArgsConstructor ■ @Log ■ @RequiredArgsConstructor ■ @Delegate ■ @AllArgsConstructor ■ @Data 6
- 7. Lombok-pg Where, Who, How Why? ■ https://github.com/peichhorn/ ■ Extends Lombok with additional lombok-pg/ annotations such as: ■ Philipp Eichhorn ■ @Singleton ■ peichhorn @ github ■ @FluentSetter ■ @Builder ■ Delivers its own common AST ■ and more! API ■ Easier to write cross compiler AST 7
- 8. Groovy AST Transformations Where, Who, How Why? ■ https://groovy.codehaus.org ■ Groovy plays nicely with Java ■ The Groovy Team ■ Compile time metaprogramming executes faster than runtime ■ Compile time metaprogramming ■ Changes visible to other JVM ■ Changes registered in the languages bytecode 8
- 9. Some Annotations ■ @Bindable / @Vetoable ■ @Delegate ■ @Grab ■ @Log ■ @Immutable ■ @Synchronized ■ @Singleton ■ @AutoClone ■ @ToString ■ @AutoExternalize ■ @EqualsAndHashCode ■ @TupleConstructor ■ @TypeChecked ■ @Canonical ■ @CompileStatic 9
- 10. Q&A Andres Almiray @aalmiray